Sanding machine



Dec. 26, 1933. G, A. SCHIPPER 1,941,275

SANDING MACHINE Filed Jan. 14. 1930 3 Sheets-Sheet l 4 INVENTOR.

mswza A TTORNE Y.

Dec. 26, 1933. G A SCHIPPER 1,941,275

SANDING MACHINE Filed Jan. 14. 1930 s Sheets-Sheet s u 27 4 o P 3+3; 0 4+ 0 n J 1 VENTOR.

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Patented Dec. 26, 1933 OFFICE n Claims.

My invention relates tosanding-machineaand in part to certain improvements over the 'sanding machines disclosed in my. co-pending appli cation, Serial No. 295,247, filed July 25,- 1928.

. The principal objectof the present invention is to provide a sanding machine of rotary type in which spindles, or other similar pieces, may be sanded with great speed, and in which the work may be inserted and removed from the machines at times when the carrying spindles have stopped,

thus facilitating and making safe the insertion, removal and centering of-the work.

A further object ofthe invention is to provide a construction wherein the head stock spindles are movable, instead of the tail stock spindles, for the removal of work therefrom.

A. still further object of the invention is to'provide a clutch mechanism for the movable head stock, of such a nature that the loading of the Work tends to reenforce and augment the work pressure thereby rigidly securing the work between the head and tail stocks.

Further objects of the invention will appear from the following detailed description thereof.

-In the drawings:

Figurel is a front view of a sanding machine constructed in accordance with this invention.

Figure 2 is an end view of said machine;

Figure 3 is a section of one of the head stock spindles and connections.

Figure 4 is a sectional view of a detail.

Figure 5 is an elevation, partly in-section, of the sanding frame oscillating connections.-

The numeral 1 indicates the main frame of my new sanding machine. Mounted between standards 2 and 3 of said machine is a rotating shaft 4. Also mounted in bearings on the, frame l is a power shaft 5 having a pulley 6- arranged to be connected to any suitable source of power. The shaft 5 is also provided with a pulley 7 inside the frame which is connected by means of a belt 8 with a pulley 9 mounted on a shaft 10 in a bearing carried by bracket 11 secured in the frame. The outer end of the shaft-9 carries a worm l2 engaging a worm wheel 13 securely mounted on a shaft 14 mounted in hearings on bracket 15 secured to the frame. The shaft 14 carries a bevel gear 16 rigidly secured which intermeshes with a similar gear 17 carried by an oblique shaft 18 mounted in bearings, one of which is in the bracket 15, and the other in a bracket 19 secured to the frame. The upper end of the shaft 18 carries a bevel gear 20 which intermeshes with a large bevel gear 21 keyed in the outer end of the main shaft 4. It will thus be seen that the rotation of the power shaft 5 will cause the main shaft 4 to rotate at a slower rate of speed.

The tail stock spindles 22 are rotatable in bearings 23 carried by a circular tail plate 24 carried by a hub 25 which is slidable on the shaft 4, but which may be rigidly locked against longitudinal movement by means of a locking device 26. The tail stock spindles 22' have no individual longitudinal movement, but are collectively movable 5 by sliding the'tail plate 24 on the shaft 4 as indicated.

"The head stock spindles 27 are carried between two circular plates 28' and 29, which are carried by a'hub 30 through which set screws 31 7 passto secure the plate'rigidly on the shaft 4. The head stock spindles 27 and tail stock spindles 22 are,ofco'urse, centered in pairs.

The spindles 2'7 are slidablein sleeves 32, see Figure 3, and are interlocked therewith. by means 7 of cam teeth 33 o'nthe spindles which fit into correspondingly shaped notches 34 in the sleeves. The sleeves 32 are mounted in ball bearings 35 and 36 carried respectively by the plates 28 and 29, and are provided withpulleys 37 which are keyed thereon; The rear end of each of the sleeves 32 is provided with a cap 38 threaded thereon, the spindle 27 extending through a central opening in said cap, and being provided on its outer end with a flanged head 39. The interior portion of the spindle 27 is of reduced dimension, and may be a separate rod securely fixed in the inner end of the spindle proper, if desired, as shown in Figure 3. A compression spring 40 is mounted inside the sleeve 32 around the reduced portion of the spindle, and abuts against the shoulder formed by the spindle proper and against the cap 38.

Mounted in brackets 41 secured on the annular plate 28 are bell cranks 42, each of which is provided with a yoke head 43 adapted to abut against the flange 39 of one of the spindles, the other arm of each of the bell cranks is provided with a roller 44 which is adapted to be engaged by the cam surface 46 of an arcuate plate 4'? which is secured on the standard 2 of the frame, the plate 47 thus serving to rock the bell cranks atsuitable intervals during the rotation of the shaft 4 to withdraw the head stock spindles and release the work.

Securely mounted on the shaft 5, is a pulley 48, and rotatably mounted on a shaft 49 carried by the upper end of the standard 2 is a pulley 50. Also rotatably mounted on a shaft 51 carried by a pivotally mounted arm 52 is a pulley 58. no

Each of the pulleys 48, and 53, as well as each of the pulleys 3'7 carried by the spindle sleeves 32 is provided with a plurality of grooves within which round belts 54 operate, the belts being disposed as shown in Figure 2 so as to operatively connect with such of the pulleys 37 as are toward the rear of the machine and in position to bring the work into contact with sanding brushes carried betweenfra'mes 56, 'thepiv'oted pulley 53 serving as an idler properly to tension-the belt. The frames 56 are adjustable by meanso f, bolts 57 operating in slots in extensions 58 of hanging frames 59 toward and away from the work can ried by the spindles.

otally connected to brackets 61 secured-ona rod 62 carried by rear standards 63supported by the, frame. The lower ends of the frames 59 "are se cured to a shaft 64 which is caused to reciprocate in the frame 1 by means of a rod 65 which is pivotally connectedwith anarm'fifi rigidlysecured onthe shaft .64,.the otherend ofthe. rod 65 is provided with a head 67 having a circular opening within which an eccentric 68 secured on the end of shaft 14. operates. j

The operation of my new sanding machine is as follows:

Power being applied tolthe pulley'6, the shaft 4 is caused to rotate at the desired speed, also the headijstock spindles "27 to the rear of the machine, are rotated I by: means of the "belts 54 which contact with the pulleys 37 of saidtspin dies. The operator standing at the front of .the machinehas dead spindles within which'to feed the 'work and from which to remove the" same. The spindles, however, 'continuing'to revolve around the axis ofshaft 4,"work thus'placed between the work' carrying spindles is brought into contact with thelsa'nding brushes during approximately one half of. the timeirequired' for therotation of the shaftj4, during which time the work is revolved by the carrying spindles. Wheneach spindle .in turn is thusiibrought' into position where its operating pulley. is not engagedby the .belts 54, the head stock spindle 2'7 is withdrawn .by the connected bell crank 42 riding on thecam plate 47, and the finished piece'is thus automatically released from themachine. A new piece may then be inserted between" the spindles, and the bell'crank passing beyond the plated? .is released permitting the compression springfl-io'to force the spindle 27 against the piece to be operated on. Byreason of the sloping'edges of the notches 34 and teeth 33, the loading on the work tends to causea relatively faster movement of the sleeve withrespect'to the spindle, thus forcing the spindleYoutwar'dly and causing it 'to' grip more firmly the piece operated" on; Excess loadingfwhich might otherwise cause undesired removal of the work from the spindles, "in my present constructionis thus utilizedto 'cau'se'the spindles more firmly to grip thesarne.

It. will be noted further that by reason of the placement of the tension mechanism'of the spindles in the headstock, it is possible to lighten the general frame construction andperrnit the tail stock to supported'entirely by the rotating shaft thus simplifying andmateriallyieducing the cost of construction.

During the operation of the machine, the sanding brushes are oscillated longitudinally over the work in'a manner similar to that performed by the machine described" in my'said' co-pending application. a w

Having thus fullydscribe'd my invention, What Frames 59 are pivoted on. links 60, the upper ends of said links being"piv-' vtiornsaid sleeve being provided with a notch for said tooth of shape corresponding to said tooth whereby the loading on said .spindle will cooperate with said outwardly forcing means.

2. In a sanding machine, a head spindle cons'truction comprising a plate, a sleeve rotatably mounted in said plate, a spindle slidably mounted in said sleeve, 'a spring mounted in said sleeve a d arranged to force said spindle outwardly to hold work, a tooth on said spindle, the rear "edge 'of said tooth comprising a cam surface diverging from its end in the direction opposite toythe idirection .offspindle rotation, said sleeve being provided with a notch for said tooth of a shapecorresponding to said tooth, whereby the loading 'on said spindle will cooperate with said spring. I,

3. In a sanding machine, a head spindle construction comprising a pair of plates, a sleeve rotatablymounted'in said plates, a spindle slid- 1 ably mounted in said sleeve, means for normally forcing said spindle outwardly to hold work, a tooth on said spindle, the rear edge of said tooth comprising-a cam surface diverging from its end in thedir'ection opposite to the direction of spindle rotation, said sleeve being provided with a notch of shape corresponding to said tooth, whereby the loading on said spindle will cooperate with said outwardly forcing means.

4. In a sanding machine, a head spindle construc-tion comprising a pair of plates, a sleeve rotatably mountedin said plates, a spindle slidably'mounted in said sleeve, a spring mounted in said sleeve and arranged to force said spindle outwardly to hold work, a tooth on said spindle,

the'rear edge of said tooth comprising a cam surface diverging from its end in the direction opposite to the direction of spindle rotation, said sleeve being provided with a notch of shape corresponding to said tooth, whereby the loading on said spindle will cooperate with said spring.

5. In a sanding machine, a rotating shaft, a pair of plates rigidly mounted on said shaft, a plurality of sleeves rotatably mounted in said plates and disposed radially around said shaft,

pulleys carried by said sleeves, a belt, pulleys for operating a belt on one side of said shaft to operatively engage said first mentioned pulleys during a fractional'part of their rotation around theaxis of said shaft to actuate said sleeves,

a spindle slidably mounted in each of said sleeves,

a tooth on each of said spindles, the rear edges of said teeth being cam surfaces diverging from the teeth ends in the direction opposite to the direction of spindle rotation, each of said sleeves a being provided with a notch for its spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle is arranged to force the same toward said load.

6. In a sanding machine, a rotating shaft, a

pair of plates, rigidly mounted in said shaft, a plurality off sleeves rotatably mounted in said plates and disposed radially around said shaft, pulleys carried bylsaid sleeves, abelt, pulleys for operating a belt on one side of said shaft to operatively engage said first mentioned pulleys during a fractional part of their rotation around the axis of said shaft to actuate said sleeves, springs mounted in said sleeves arranged to force the spindles outwardly to hold work, a tooth on each of said spindles, the rear edges of said teeth being cam surfaces diverging from the teeth ends in the direction opposite to the direction of spindle rotation, each of said sleeves being provided with a notch for its spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle will cooperate with said spring.

'7. In a sanding machine, a rotating shaft, a plate slidably mounted on said shaft, a plurality of tail spindles rotatably mounted in said plate and disposed radially around said shaft, a pair of plates rigidly mounted on saidshaft, a plurality of sleeves rotatably mounted in said plates and disposed radially around said shaft, and severally in axial alignment with .said tail spindles, pulleys carried by said sleeves, a belt, pulleys for operating a belt on one side of said shaft'to operatively engage said first mentioned, pulleys during a fractional part of their rotation around the axis of said shaft to actuate said sleeves, a spindle slidably mounted in each of said; sleeves, means for normally forcing said spindles toward said tail spindles, a tooth on each of said spindles, the rear edges of said teeth beingcam surfaces diverging from the teeth ends in the direction opposite to the direction of spindle rotation, each of said sleeves being provided with a notch for its spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle is arranged to force the same toward its tail spindle.

8. In a sanding machine, a rotating shaft, a plate slidably mounted on said shaft, a plurality of tail spindles rotatably mounted in said plate and disposed radially around said shaft, a pair of plates rigidly mounted on said shaftya plurality of sleeves rotatably mounted in said plates and disposed radially around said shaft, and severally in axial aligmnent with said tail spindles, pulleys carried by said sleeves, a belt, pul eys for operating a belt on one side of said shaft to operatively engage said first mentioned pulleys during a fractional part of their rotation around the axis of said shaft to actuate said sleeves, aspindle slidably mounted in each of said sleeves, springs mounted in said sleeves and arranged to force said spindles toward said tail spindles, a tooth on each of said spindles, the rear edges of said teeth being cam surfaces diverging from the tooth ends in the direction opposite to the direction of spindle rotation, each of said sleeves being provided with a notch for its spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle is arranged to force the same toward its tail spindle.

9. In a sanding machine, a rotating shaft, a plate slidably mounted on said shaft, a plurality of tail spindles rotatably mounted in said plate and disposed radially around said shaft, a pair of plates rigidly mounted on said shaft, a plurality of sleeves rotatably mounted in said plates and disposed radially around said shaft, and severally inaxial alignment with said tail spindles, pulleys carried by said sleeves, a belt, pulleys for operating a belt on one side of said shaft to operatively engage said first mentioned pulleys during a fractional part of their rotation around the axis of said shaft to actuate said sleeves, a spindle slidably mounted in each of said sleeves, means for normally forcing said spindles toward said tail spindles, a tooth on each of said spindles, the rear edges of said teeth being cam surfaces diverging from the tooth ends in the direction opposite to the direction of spindle rotation, each of said sleeves being provided with a notch for the spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle is arranged to force the same toward its tail spindle, a plurality of hell cranks pivotally mounted on the outer of said pair of plates, one end of each of said bell cranks being arranged to engage one of said slidable spindles, a cam plate fixedly mounted in the path of travel of the other ends of said bell cranks during the rotation of said shaft, whereby said bell cranks are caused periodically to withdraw said spindles.

'10. In a sanding machine, a rotating shaft, a plate slidably mounted on said shaft, a plurality of tail spindles rotatably mounted in said plate and disposed radially around said shaft, a pair of plates rigidly mounted on said shaft, a plurality of sleeves rotatably mounted in said plates and disposed radially around said shaft, and severally in axial alignment with said tail spindles, pulleys carried by said sleeves, a belt, pulleys for operating a belt on one side of said shaft to operatively engage said first mentioned pulleys during a fractional part of their rotation around the axis of said shaft to actuate said sleeves, a spindle slidably mounted in each of said sleeves, springs mounted in said sleeves and arranged to force said spindles toward. said tail spindles, a tooth on each of said spindles, the rear edges of said teeth being cam surfaces diverging from the tooth ends in the direction opposite to the direction of spindle rotation, each of said sleeves being provided with a notch for its spindle tooth of shape corresponding to said tooth, whereby said sleeve and spindle are interlocked and the loading on said spindle is arranged to force the same toward its tail spindle, a plurality of hell cranks pivotally mounted on the outer of said pair of plates, one end of each of said bell cranks being arranged to engage one of said slidable spindles, a cam plate fixedly mounted in the path of travel of the other ends of said bell cranks during the rotation of said shaft, whereby said bell cranks are caused periodically to withdraw said spindles.

GEORGE A. SCHIPPER. 

